Answers

2016-03-09T23:04:50+05:30
Because they take too much time and the antibiotic bacteria cant find easily 
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2016-03-16T16:14:08+05:30
Because the antibiotics are made from the bacteria which is causing the disease and it is very difficult to find the bacteria which are suitable for the antibiotics to be made....HOPE THIS WILL HELP YOU ....
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